If you forget your au ID password and are unable to log in, you must first set a new password.
You have been notified of your au ID/password by “au ID 及び関連サービスに関する大切なお知らせ (An important notice regarding your au ID and related services)” or “ご利用開始のご案内 (Guide of start using the service)”
■Sample Guide of start using the service